$OpenBSD: patch-conf_main_cf,v 1.8 2017/03/04 22:09:43 sthen Exp $
--- conf/main.cf.orig	Wed Apr  1 06:56:39 2015
+++ conf/main.cf	Wed Aug 10 19:48:51 2016
@@ -133,6 +133,9 @@ mail_owner = postfix
 #inet_interfaces = $myhostname
 #inet_interfaces = $myhostname, localhost
 
+# OpenBSD is IPv6-capable - use all available address families.
+inet_protocols = all
+
 # The proxy_interfaces parameter specifies the network interface
 # addresses that this mail system receives mail on by way of a
 # proxy or network address translation unit. This setting extends
@@ -673,4 +676,3 @@ sample_directory =
 # readme_directory: The location of the Postfix README files.
 #
 readme_directory =
-inet_protocols = ipv4
